[brianleb]

Actually, I believe what you want is 3mm, which I believe they use in accounting. Lowercase m in this instance would stand for milli-, as in thousand. So 3mm would be 3 thousand thousand. 3M is technically correct, though confusing in this specific case. Capital M would indicate Mega, as in the progression from kilobit to megabit to gigabit.

[lowbloodsugar]

3MM is three million, for US accountants and thus engineers writing docs for VPs. 3mm is three millimeters.

[Yizahi]

Gamers just write it as 3kk. (PS: never seen MM used as a "million" even in my two decades on the internet)

[kukkamario]

Eh... Haven't seen anyone using 3kk to abbreviate 3M. 3M is common and B for billion. Those are also used in many games to shorten currencies.

[squigz]

This seems to be a (IRL) cultural thing - the vast majority of people I play EVE with use k/m/b/t, but a small percent does use k/kk/kkk

[Yizahi]

Afaik it came from the first Korean MMOs, like Lineage. Maybe even earlier, but I saw such format there first.

[neilv]

3mm hotel keycard form factor.

[toss1]

Interesting, I'd seen it as "MM", as in "Thousand Thousand" in Roman numerals.

Of course lowercase "mm" is most recognizable as millimeter, so that would be confusing in a different way.